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DA25

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3

BROADBAND DISCONE

ANTENNA KIT

DA25

Ramsey Publication No. MDA25

Price $5.00

TABLE OF CONTENTS

Introduction ................................. 4
Discone Circuit description ......... 8
Parts list ...................................... 10
Assembly instructions ................. 11
Installation and Important notes .. 16
Using your DA25 ........................ 17
Troubleshooting guide ................ 17
Warranty ..................................... 19

KIT ASSEMBLY

AND INSTRUCTION MANUAL FOR

RAMSEY ELECTRONICS, INC.

590 Fishers Station Drive

Victor, New York 14564

Phone (585) 924-4560

Fax (585) 924-4555

www.ramseykits.com

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Содержание DA25

Страница 1: ...waves for signals with this unique kit Omni directional performance no need to point in any direction Learn about antenna theory and what makes the discone an ideal broadband antenna Covers all freque...

Страница 2: ...pacitance Meter RAMSEY AMATEUR RADIO KITS DDF1 Doppler Direction Finder HR Series HF All Mode Receivers QRP Series HF CW Transmitters CW7 CW Keyer CPO3 Code Practice Oscillator QRP Power Amplifiers RA...

Страница 3: ...e Circuit description 8 Parts list 10 Assembly instructions 11 Installation and Important notes 16 Using your DA25 17 Troubleshooting guide 17 Warranty 19 KIT ASSEMBLY AND INSTRUCTION MANUAL FOR RAMSE...

Страница 4: ...early antennas were quite large we ll talk a little more about this later due to the lower frequencies being transmitted Again more recent improvements have allowed us to use higher frequencies with...

Страница 5: ...is regular we say that the wave has a frequency of repetition This frequency in fact is the reciprocal of the time it takes for the wave to complete one full cycle mathematically speaking f 1 T By the...

Страница 6: ...e old days of radio The common use of low frequencies meant much longer wavelengths and significantly larger antennas for reception Today s modern electronic devices tend to operate at much higher fre...

Страница 7: ...e frequency or the length of wire to match a given frequency Antenna Gain Another performance specification common with antennas is their gain usually given in dBi units To understand this concept let...

Страница 8: ...he line and precipitate a high VSWR Typical usable VSWR ratios are in the 3 0 1 0 range for commercial available communications equipment while the robust discone design actually outperforms these at...

Страница 9: ...transmit antenna as well Experimenters have used this particular design for a host of transmit applications including increasing the distance of their PC s wireless LAN to boosting the range of cordle...

Страница 10: ...sical relationship to each other so there s minimal chance of inserting wires into wrong holes Second whenever possible we install in an order that fits our Learn As You Build Kit building philosophy...

Страница 11: ...eived parts against the parts list The parts list describes the vari ous markings that may be found on the kit parts Carefully sort the parts into small piles an empty egg tray does nicely for this pu...

Страница 12: ...illed with tinned copper We will use this circuit board to transition form the coaxial cable assembly to the antenna 3 Insert the full length tinned center conductor wire through the P1 hole in the ce...

Страница 13: ...n Fasten the screws into place using the 6 32 stand offs pro vided Be careful not to over tighten the nylon parts or they may shear off Now we are getting to probably the most difficult solder connect...

Страница 14: ...the ground connection completely This may take a little while depending on the wattage of your soldering pencil Whew Well we are over the worst of it now just a few more steps to complete assembly of...

Страница 15: ...ruding from the disk Have a look at the above diagram to help out if necessary CONGRATULATIONS Your discone antenna is now complete Have a final look over your work paying particular attention to the...

Страница 16: ...it the coupler firmly into place after threading the cable assembly through it If the glue sets up with the coupling in a little tilted you will forever see a slightly off balance discone IMPORTANT NO...

Страница 17: ...h wire Make sure that the wire hasn t folded under the disk and shorted by touching the ground connections somewhere all solder connections Still having trouble While we had hoped that it wouldn t com...

Страница 18: ...we value your opinions comments and additions that you would like to see in future publications Please submit comments or ideas to Ramsey Electronics Inc Attn Hobby Kit Department 590 Fishers Station...

Страница 19: ...be assured that the 1K ohm resistors are actually the missing 10 K parts Hum m m I guess the red band really does look orange Ramsey Electronics project kits are packed with pride in the USA If you b...

Страница 20: ...RTS05 Small Diagonal Cutters Ramsey RTS04 Technician Tool Set Ramsey TK405 ADDITIONAL SUGGESTED ITEMS Optivisor Magnifier Headband Ramsey OPMAG Holder for PC Board Parts Ramsey RTS13 Desoldering Brai...

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